JP2001061263A - Internal combustion engine driven generator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain power for driving an igniter, without scarifying the part of a power to be supplied to load. SOLUTION: A main generator is composed of a flywheel magnet rotor 1 and a stator 2. Under the condition that a pair of magnetic poles 8 and 9 for ignition standing at a prescribed interval apart in the circumferential direction of the flywheel 4 are projected around the peripheral wall of the flywheel and are positioned between the magnetic poles 8 and 9 in pair, a permanent magnet 12 for ignition is attached to the periphery of the peripheral wall of the flywheel. A magnetic field for ignition is constituted of this permanent magnet 12 for ignition and the magnetic poles 8 and 9 in a pair for ignition, and a generating piece 3 for ignition, which has a magnetic pole which opposes this magnetic field for ignition, is arranged outside the flywheel 4.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnet generator for an internal combustion engine which generates electric power by being driven by the internal combustion engine.

[0002]

2. Description of the Related Art As a small portable generator which generates electric power by being driven by an internal combustion engine, a multi-pole flywheel magnet generator is often used to obtain high output. This type of magnet generator includes a flywheel magnet rotor attached to a crankshaft of an engine, and a stator arranged inside the flywheel magnet rotor and attached to a case of the engine.

[0003] A flywheel magnet rotor is composed of a flywheel formed substantially in a cup shape from a ferromagnetic material, and a magnet field formed on an inner periphery of a peripheral wall portion of the flywheel. The flywheel magnet rotor includes an armature core having a magnetic pole portion facing the magnetic field magnetic pole, and an armature coil wound around the armature core.

As the armature core of the stator, a multipole annular star core having a structure in which a number of salient poles are radially projected at equal angular intervals from the outer periphery of an annular yoke is generally used. An armature coil is wound around each salient pole portion of the iron core.
An AC voltage having a frequency proportional to the engine speed is induced in the armature coil.

The AC voltage obtained from the armature coil is rectified and supplied to a DC load as a DC voltage, or rectified and converted to a DC voltage, and then converted to an AC voltage having a commercial frequency by an inverter. Supplied to the AC load.

In a power generator using this type of magnet generator, when the internal combustion engine that drives the magnet generator is a spark ignition type engine, electric power for driving the ignition device for the internal combustion engine is required. I do. Therefore, in this type of conventional power generating device, a salient pole portion of the armature core of the stator is used as a salient pole portion dedicated to ignition, and a coil for driving the ignition device is wound around the salient pole portion dedicated to ignition. Was.

[0007]

As described above, in the conventional internal combustion engine drive generator, in order to obtain electric power for driving the internal combustion engine ignition device, a part of the stator armature core of the stator is provided. Since the salient pole portion is a salient pole portion dedicated to ignition, and a coil for driving the igniter is wound around the salient pole portion dedicated to ignition, a salient coil for winding an armature coil for driving the original load of the power generator. There has been a problem that the number of poles is reduced and a part of the power supplied to the original load of the power generator is sacrificed.

In order to secure electric power to be supplied to the original load of the power generator, the permanent magnets constituting the magnet field of the flywheel magnet rotor are made large and the armature core is made large to make the armature large. It is conceivable to increase the number of turns of the coil, but such a configuration is not preferable because the magnet rotor and the stator become large and the power generation device becomes large.

An object of the present invention is to obtain electric power for driving an ignition device without sacrificing a part of electric power supplied to a load and without increasing the size of a flywheel magnet rotor and a stator. It is an object of the present invention to provide an internal combustion engine driven power generation device capable of performing the following.

[0010]

According to the present invention, there is provided a flywheel comprising a main magnet field attached to an inner periphery of a peripheral wall of a flywheel which is formed in a substantially cup shape from a ferromagnetic material and is attached to a crankshaft of an internal combustion engine. Internal combustion engine including a wheel magnet rotor, an armature core having a magnetic pole portion inside a flywheel facing a magnetic pole of a main magnet field, and a stator having an armature coil wound around the armature core It is related to a magnet generator.

In the present invention, a pair of ignition magnetic pole portions arranged at a predetermined interval in the circumferential direction of the flywheel are provided on the outer periphery of the peripheral wall portion of the flywheel so as to project between the pair of ignition magnetic pole portions. The ignition permanent magnet is attached to the outer periphery of the peripheral wall of the flywheel in a state where the ignition permanent magnet is
A pair of ignition magnetic pole portions constitutes an ignition magnet field, an ignition electromotive core having a magnetic pole portion facing the ignition magnet field, and an ignition coil wound around the ignition electrogeneration core. The ignition-generating element provided with is disposed outside the flywheel.

The pair of ignition magnetic pole portions can be formed by projecting a part of the peripheral wall portion of the flywheel outward in the radial direction.

The pair of ignition magnetic poles may be formed by fixing a block made of a ferromagnetic material to the outer periphery of the peripheral wall of the flywheel.

As described above, the ignition magnet field is formed on the outer periphery of the peripheral wall of the flywheel of the flywheel magnet rotor, and the magnetic pole portion of the ignition generator is opposed to the ignition magnet field. Accordingly, it is possible to obtain the power for driving the ignition device without sacrificing the power for driving the original load of the power generation device.

If the load of the power generator is the same, the permanent magnet and the armature core constituting the main magnet field may be of the same size as those used in the conventional power generator. Electric power for driving the ignition device can be obtained without increasing the size of the magnet rotor and the stator.

Further, when the ignition magnetic pole portion is formed by projecting a part of the peripheral wall portion of the flywheel outward in the radial direction, a separate component is not required as the ignition magnetic pole portion. Thus, the number of parts can be reduced.

In the case where a block made of a ferromagnetic material is used as the ignition magnetic pole, it is not necessary to project a part of the peripheral wall of the flywheel outward in the radial direction. Processing can be facilitated.

In the present invention, the main magnet field attached to the inner periphery of the peripheral wall portion of the flywheel is disposed so as to be shifted toward the opening side of the flywheel, and the main magnet field and the flywheel The magnet mounting recess is formed on the outer periphery of the flywheel peripheral wall by deforming a part of the peripheral wall of the flywheel located between the bottom wall and the flywheel so as to be recessed inward in the radial direction. A permanent magnet for ignition is mounted in the concave portion for ignition, a permanent magnet for ignition is formed by the permanent magnet for ignition and a region of the peripheral wall portion adjacent to the concave portion for mounting magnet, and a magnetic pole portion facing the magnetic field for ignition is formed. The ignition generator including the ignition core and the ignition coil wound around the ignition core may be arranged outside the flywheel.

In the case of such a configuration, since the protrusion is not formed on the outer periphery of the flywheel, the radial size of the power generator can be reduced. When the permanent magnet for ignition is mounted on the outer periphery of the flywheel, when the flywheel magnet rotor is mounted on the engine, there is a risk that the permanent magnet for ignition on the outer periphery of the flywheel may be hit by an object and the magnet may be damaged. However, if the permanent magnet for ignition is mounted in the recess formed on the outer periphery of the flywheel as described above, it is possible to eliminate the possibility that the magnet is damaged.

[0020]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below with reference to the embodiments shown in FIGS. FIG.
(A) and (B) show a first embodiment of the internal combustion engine driven power generation device according to the present invention, (A) is a front view,
(B) is a sectional view taken along line YY of (A). In these figures, 1 is a flywheel magnet rotor mounted on a crankshaft of an internal combustion engine (not shown), 2 is a stator mounted on a case of the internal combustion engine, and 3 is an ignition generator that is also mounted on the case of the internal combustion engine. These constitute an internal combustion engine drive generator.

The flywheel magnet rotor 1 is arranged at equal angular intervals on a flywheel 4 formed into a substantially cup-like shape by drawing an iron plate and forming an inner periphery of a peripheral wall portion 4a of the flywheel. And 2n poles (n is an integer, in this example, n = 9) permanent magnets 5, 5,...
8 poles), a rotating shaft mounting boss 7 mounted to the center of the bottom wall 4b of the flywheel by a plurality of rivets 6, and a predetermined distance in the circumferential direction of the flywheel 4. In this state, a pair of ignition magnetic pole portions 8 and 9 protruding from the outer periphery of the peripheral wall portion 4a of the flywheel, and the peripheral wall of the flywheel positioned between the pair of ignition magnetic pole portions 8 and 9 Screw 1 together with pole piece 10 on the outer periphery of portion 4a
1 and an ignition permanent magnet 12 attached to the motor.

The 2n permanent magnets 5, 5,... Constituting the main magnet field are magnetized in the radial direction by alternately changing the magnetization direction so that different poles are alternately arranged in the circumferential direction. I have. A tapered hole is formed at the center of the boss 7 so as to penetrate the boss in the axial direction. The flywheel magnet rotor 1 is fitted with a crankshaft of an internal combustion engine (not shown) fitted in the tapered hole. Attached to the crankshaft.

For example, a rare earth magnet is used as the ignition permanent magnet 12, and the ignition permanent magnet 12 is magnetized in the radial direction of the flywheel. In the illustrated example, the pole piece 10 has N
The ignition permanent magnet 12 is magnetized so that a pole appears. In this case, a magnetic pole (S pole in the illustrated example) having a different polarity from the magnetic pole appearing on the pole piece 10 appears on the ignition magnetic pole portions 8 and 9 arranged on both sides of the ignition permanent magnet 12, respectively. Ignition permanent magnet 12 and a pair of ignition magnetic pole portions 8 and 9
Thus, a three-pole ignition magnet field is formed on the outer periphery of the flywheel.

The stator 2 is made of a laminated body of steel plates, and has a multipolar armature core 13 having a magnetic pole portion facing the main magnet field of the flywheel magnet rotor 1, and wound around the armature core. The armature coil 14 is turned. The armature core 13 has an annular yoke portion 13a and 2n (n is an integer, 2n = 18 in the illustrated example) salient poles 13b1-13 protruding radially from the outer periphery of the yoke portion at equal angular intervals.
It consists of an annular star core with b18. Coils 14a to 14r are wound around salient poles of the armature core 13, respectively, and these coils 14a to 14r are connected in series or series / parallel to form a single-phase circuit.
4 are configured. The AC output obtained from the armature coil is led out through a wire harness (not shown) and input to a rectifier (not shown).

The stator 2 includes a flywheel magnet rotor 1
The yoke 1 of the armature core 13 is arranged inside the
Screwing a screw which is positioned in the internal combustion engine case with the inner peripheral portion 13c of 3a as a spigot portion and passes through a mounting hole 13d provided in the yoke portion 13a into a stator mounting portion provided in the engine case or the like. Thereby, it is fixed to the case of the internal combustion engine.

In this example, the number of salient poles of the armature core is 2n
Armature coils are connected in a single phase, but the number of salient poles of the armature iron core is 3n with respect to the number of poles 2n of the main magnet field of the flywheel magnet rotor 1; By connecting the coils wound around the salient poles in a three-phase manner, the armature coil can be made into a three-phase winding.

The ignition generator 3 includes an ignition generator core 15.
And an ignition coil 16 wound around the iron core. The illustrated ignition generator core 15 has magnetic pole portions 15a1 and 15b1 opposed to the magnetic pole of the ignition magnet field via a predetermined gap. Are formed in a U-shape by a pair of legs 15a and 15b each having one end and a bar-shaped iron core 15c provided to connect the other ends of the pair of legs 15a and 15b.

In the illustrated example, dovetail grooves are formed at both ends of the bar-shaped core 15c, and dovetails 15a2 and 15b2 formed at the other end of the pair of legs 15a and 15b are formed in the dovetail grooves at both ends of the bar-shaped core 16 respectively. Fitted, rod-shaped iron core 15c
And the legs 15a and 15b are connected.

The ignition coil 16 comprises a primary coil 16a and a secondary coil 16b. The primary coil and the secondary coil are housed in an ignition coil case 17 made of a synthetic resin and attached to a rod-shaped core 15c. Fitted.

In the example shown, the ignition coil race 17
The ignition circuit unit 19 is housed together with the ignition coil therein. The ignition circuit unit 19 includes a circuit for controlling the primary current flowing through the primary coil 16a of the ignition coil to be cut off at the ignition timing of the internal combustion engine. A primary current control transistor which is connected in parallel with the primary coil of the ignition coil and conducts when a half cycle voltage of one polarity is induced in the primary coil to flow a short-circuit current to the primary coil of the ignition coil; and A known current interrupter having a configuration in which a component of a transistor control circuit that detects a voltage between the collector and emitter of the transistor and turns off the transistor when the detected voltage reaches a set value is mounted on a pudding and a substrate. An ignition circuit unit of the form can be used.

The ignition coil case 17 is filled with an insulating resin such as epoxy, and the primary coil 1 is filled with the insulating resin.
6a and 16b and the ignition circuit unit 19 are molded.

The terminal on the winding start side of the secondary coil 16b of the ignition coil is connected to the iron core 15 and grounded, and the terminal on the winding end side of the secondary coil is led out through a high-voltage cord 18 to the outside. Connected to the spark plug attached to the cylinder.

The ignition generator 3 is provided with mounting holes 15 provided in the legs 15a and 15b of the ignition generator core, respectively.
d attached to the engine case by screws screwed into the case of the internal combustion engine through d.
The magnetic pole portions 15a1 and 15b1 at the tips of the legs 15a and 15b are opposed to the ignition magnet field on the outer periphery of the flywheel via a predetermined gap.

In the illustrated ignition generator 3, the angular interval between the magnetic pole portions 15a1 and 15b1 is set substantially equal to the angular interval between adjacent magnetic poles of the ignition magnet field, and the magnetic pole portion 15a1 is set. And 15b1 are each shown in FIG.
As shown in (A), the respective polar arc angles of the magnetic pole portions 15a1 and 15b1 are set so that the magnetic pole portions 15a1 and 15b1 can face each other over adjacent magnetic poles of the ignition magnet field on the outer periphery of the flywheel.

When the flywheel magnet rotor 1 rotates with the rotation of the engine, when the magnetic field for ignition passes through the position of the magnetic pole portion of the ignition core 15, the magnetic flux flowing through the iron core 15 changes for one cycle. This alternation of the magnetic flux induces a voltage of one cycle and a half in which a half-wave voltage of one polarity appears before and after a half-wave voltage of the other polarity in the primary coil of the ignition coil.

The ignition circuit unit 19 turns on a transistor connected in parallel to the primary coil of the ignition coil when a half-wave voltage of one polarity is induced in the primary coil of the ignition coil. Through the primary current
When the primary current becomes sufficiently large and the voltage across the primary coil reaches a set value, the transistor is turned off to cut off the primary current. The interruption of the primary current induces a high voltage in the secondary coil 16b of the ignition coil. Since this high voltage is applied to a spark plug attached to a cylinder of the engine, a spark is generated in the spark plug and the engine is ignited.

The armature coil 1 of the magnet generator shown in FIG.
4, an AC voltage is induced in synchronization with the rotation of the engine. If the load is independent of the frequency variation, the armature coil 1
Although the output of 4 is supplied to the load as it is, if the load is a DC load (for example, a battery), the AC output of the armature coil is rectified by the rectifier circuit and supplied to the load. When the load is an AC load operating at a constant frequency (for example, a commercial frequency), the output of the armature coil 14 is once rectified by a rectifier circuit, and then converted to an AC voltage of a predetermined frequency by an inverter. Supplied to the load.

As described above, when the ignition magnet field is formed on the outer periphery of the flywheel 4 and the ignition electromotive force 3 faces the ignition magnet field, the armature core 13
All of the salient poles can be used to wind an armature coil that generates electric power to drive the generator's original load, so ignition can be performed without sacrificing the generator's output at all. Electric power for driving the device can be obtained.

FIGS. 2A and 2B are enlarged views of an example of the structure of the ignition magnet field portion in the embodiment shown in FIG. 1. FIG. FIG. 1B is a top view of a main part. In this example, a pair of ignition magnetic pole portions 8 and 9 are formed on the outer periphery of the flywheel by punching a part of the peripheral wall portion 4a of the flywheel 4 outward in the radial direction by press working. Between the ignition magnetic pole portions 8 and 9, an ignition permanent magnet 12 and a pole piece 10 are screwed together with a screw 1.
1 and fastened to the peripheral wall 4a of the flywheel. The ignition permanent magnet 12 is magnetized in the radial direction, and S, N, and S magnetic poles appear on the outer peripheral surfaces of the ignition magnetic pole 8, the pole piece 10, and the ignition magnetic pole 9 as shown in the figure.

In the example shown in FIG. 2, a part of the peripheral wall of the flywheel is punched out to form the pair of ignition magnetic poles 8, 9, but as shown in FIG. A block of magnetic material is screwed around the outer periphery of the portion 4a.
0, 21 so that the ignition magnetic pole portion 8,
9 may be formed.

FIGS. 4A and 4B show another embodiment of the present invention. FIG. 4A shows a cross section taken along the line Y--Y of FIG. (B) shows a cross section taken along the line ZZ in FIG.

In the embodiment of FIG. 4, permanent magnets 5, 5,..., Which are attached to the inner periphery of the peripheral wall portion 4a of the flywheel 4 and constitute a main magnet field, are biased toward the opening side of the flywheel 4. The flywheel peripheral wall portion 4a located between the main magnet field and the flywheel bottom wall portion 4b is deformed by press working so as to be recessed inward in the radial direction. Thus, a magnet mounting recess 22 is formed on the outer periphery of the peripheral wall 4a of the flywheel. A permanent magnet for ignition 12 is mounted together with the pole piece 10 in the magnet mounting recess 22 by means of a screw 11 and is adjacent to the magnet mounting recess 22 of the ignition permanent magnet 12, the pole piece 10 and the peripheral wall 4a of the flywheel. Regions 4a1 and 4a2
Thus, a three-pole ignition magnet field is formed. The structure of the other parts of the flywheel magnet rotor 1 is shown in FIG.
Is the same as that shown in FIG.

The ignition generator 3 has the same structure as that used in the example shown in FIG. 1, and the magnetic pole portion of the ignition generator core 15 has a predetermined gap with the magnetic pole of the ignition magnet field. It is arranged on the outside of the flywheel 4 in a state where it is opposed to the airbag, and is attached to the case of the internal combustion engine.

Also in the embodiment shown in FIG. 4, an ignition magnet field is provided on the outer peripheral side of the peripheral wall 4a of the flywheel 4, and cooperates with this ignition magnet field to drive the ignition device. Since the ignition electromotive force 3 for generating electric power is arranged outside the flywheel 4, the main magnet field and the stator of the magnet generator are influenced by the presence of the ignition magnet field and the ignition electromotive force. It can be configured without receiving it. Therefore, electric power for driving the ignition device can be obtained without sacrificing the output of the main generator.

Further, in the example shown in FIG. 4, the ignition magnet field and the main field are provided at positions shifted in the axial direction of the flywheel. The ignition magnet field can be configured without any influence.

As shown in FIG. 4, pressing for forming a concave portion on the outer peripheral side of the flywheel can be performed more easily than pressing for forming a projection on the outer peripheral side of the flywheel. Therefore, with the configuration as shown in FIG. 4, the processing of the flywheel can be facilitated.

Further, as shown in FIG. 4, when the permanent magnet for ignition 12 is disposed in the concave portion 22, when the flywheel magnet rotor is mounted on the engine, it is possible to prevent the magnet from being damaged by an object hitting the magnet. There is also the advantage that it can be prevented.

In the embodiment shown in FIG. 1 and FIG. 4, the number of poles of the main magnet field and the number of poles of the stator 2 are 2n = 18. The present invention is not limited to the case where the main field is configured with 18 poles. The number of stator poles of the main generator (2n or 3
n) is also optional.

The ignition generator used in the embodiment shown in FIGS. 1 and 4 has a pair of legs and a rod-shaped core connecting the other ends of the pair of legs. The ignition coil is wound around the rod-shaped core portion of the iron core using a U-shaped ignition core, but the ignition generator has a substantially U-shaped or U-shape having a pair of legs. The ignition coil may be wound around one of the legs of the E-shaped ignition core.

In the above example, the ignition circuit unit for controlling the primary current of the ignition coil is built in the ignition element. However, the ignition circuit unit is provided outside the ignition element so that the ignition circuit unit and the ignition circuit unit are connected to each other. You may make it connect with the ignition electron emission with a wire harness.

[0051]

As described above, according to the present invention, an ignition magnet field is formed on the outer periphery of the peripheral wall of the flywheel of the flywheel magnet rotor, and the ignition magnet field is generated by the ignition magnet field. Since the magnetic pole portions of the electrons are opposed to each other, there is an advantage that the power for driving the ignition device can be obtained without sacrificing the power supplied to the original load of the power generation device.

In the present invention, when the ignition magnetic pole portion is formed by projecting a part of the peripheral wall portion of the flywheel outward in the radial direction, a separate component is required as the ignition magnetic pole portion. Therefore, the number of parts can be reduced.

Further, in the present invention, when a magnetic pole portion for ignition is formed by fixing a block of ferromagnetic material to the outer periphery of the peripheral wall of the flywheel, the peripheral wall of the flywheel is deformed. Since the ignition magnetic pole portion can be formed without performing the pressing, the flywheel can be easily processed.

In the present invention, when a concave portion is formed on the outer periphery of the peripheral wall portion of the flywheel, and a permanent magnet for ignition is arranged in the concave portion to form a magnet field for ignition, When attaching the flywheel magnet rotor to the engine, it is possible to prevent an object from hitting the magnet and damaging the magnet.

[Brief description of the drawings]

FIG. 1 shows a first embodiment of the present invention, in which (A)
FIG. 2 is a front view, and FIG. 2B is a sectional view taken along line YY of FIG.

2A and 2B show a configuration example of an ignition magnet field portion of the embodiment shown in FIG. 1, wherein FIG. 2A is a longitudinal sectional view and FIG. 2B is a top view of FIG.

FIG. 3 is a longitudinal sectional view showing another configuration example of the ignition magnet field portion of the embodiment shown in FIG. 1;

FIGS. 4A and 4B show another embodiment of the present invention, wherein FIG. 4A is a sectional view taken along the line YY in FIG. 4B, and FIG. It is a Z line sectional view.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Flywheel magnet rotor, 2 ... Stator, 3 ... Electricity for ignition, 4 ... Flywheel, 4a ... Peripheral wall part, 4b ...
Bottom wall, 5: permanent magnet, 6: rivet, 7: boss, 8,
9: magnetic pole portion for ignition, 10: magnetic pole piece, 12: permanent magnet for ignition, 13: armature core, 14: armature coil, 14a to
14r: a unit coil constituting an armature coil, 15: an ignition core for ignition, 15a, 15b: leg, 15c: rod-shaped core, 16: ignition coil, 16a: primary coil, 16
b: secondary coil, 17: ignition coil case, 18: high voltage cord, 19: ignition circuit unit, 22: recess for mounting magnet.

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 3G093 AA16 BA00 EB09 5H621 BB07 GA01 GA04 GA14 GA16 GA17 GB04 GB12 GB14 HH02 HH08 HH09 JK02 JK05 JK07

Claims (4)

[Claims] 1. A flywheel magnet rotor formed of a ferromagnetic material in a substantially cup shape and having a main magnet field attached to an inner periphery of a peripheral wall of a flywheel attached to a crankshaft of an internal combustion engine; An internal combustion engine drive generator including a stator having an armature core having a magnetic pole portion facing the magnetic pole of the main magnet field inside the wheel and an armature coil wound around the armature core, A state in which a pair of ignition magnetic pole portions arranged at a predetermined interval in a circumferential direction of the flywheel is protruded from an outer periphery of a peripheral wall portion of the flywheel, and is located between the pair of ignition magnetic pole portions. A permanent magnet for ignition is attached to the outer periphery of the peripheral wall of the flywheel, and an ignition magnet field is formed by the permanent magnet for ignition and the pair of magnetic poles for ignition. versus An internal combustion engine comprising: an ignition generator including an ignition core having an opposed magnetic pole portion; and an ignition coil wound around the ignition core, disposed outside the flywheel. Drive generator. 2. The internal combustion engine drive generator according to claim 1, wherein the ignition magnetic pole portion is formed by projecting a part of a peripheral wall portion of the flywheel outward in a radial direction. 3. The internal combustion engine driven generator according to claim 1, wherein the ignition magnetic pole portion is formed of a block of a ferromagnetic material fixed to an outer periphery of a peripheral wall portion of the flywheel. 4. A flywheel magnet rotor formed of a ferromagnetic material in a substantially cup shape and having a main magnet field attached to an inner periphery of a peripheral wall portion of a flywheel attached to a crankshaft of an internal combustion engine; An internal combustion engine drive generator including a stator having an armature core having a magnetic pole portion facing the magnetic pole of the main magnet field inside the wheel and an armature coil wound around the armature core, The main magnet field attached to the inner periphery of the peripheral wall portion of the flywheel is disposed so as to be offset toward the opening side of the flywheel, and the main magnet field and the bottom wall portion of the flywheel are arranged. A part of the peripheral wall of the flywheel located between the flywheel and the flywheel is deformed so as to be recessed inward in the radial direction to form a magnet mounting recess on the outer periphery of the peripheral wall of the flywheel. A permanent magnet for ignition is mounted in the recess for ignition, and a permanent magnet for ignition is constituted by the permanent magnet for ignition and a region of the peripheral wall portion adjacent to the concave for mounting magnet. An internal combustion engine, wherein an ignition generator including an ignition core having an opposed magnetic pole portion and an ignition coil wound around the ignition core is disposed outside the flywheel. Drive generator.